Offset mechanism for printing-presses.



c.. PI covIIIIELI. OFFSET MECHANISM FOR PRINTING PRESSES.

IIPPLIcIITIoII FILED AUG.23. I9'II. 3.91 ,010

Patented .July 27', 1915.

3 SHEETS-SHEET l.

c. P, COTTRELL. OFFSET MECHANISM FOR PRINTING PRESSES.

' Patented July 27, .1915,

v 3 SHEETS-SHEET 2 APPLICATION FILED AUG.2 3. 19H` www? C. P. COTTRELL.

OFFSET MECHANISM FOR PRINTING PRESSES. APPLICATION man Aue.2 3. 191|.

Patented July 27, 1915.

3 SHEETS-SHEET 3.

STATES PATENT Ormea CHARLES i. COMBELL, or wnsrEnLY, RHODE ISLAND, AssIeNOn, BY M'EsN-E AssreN- MENTS, To c. B.- COTTBELL a soNs COMPANY, or NEW YORK, N. Y., A CORPORATION F DELAWARE.

To all whom it may concern:

Be it known that I, CHARLES I. Comm,

a citizen of the United States, and residentof Westerly, in the .county of Washington and State of Rhode Island, have invented a newv and useful Improvementv in Offset Mechanism for Printing-Presses, of which the following is a specification.

This invention relates to offset mechanismfor printing presses and has 'for one of its objects to providenovel means for introducing. a printed `product into an offset web winding roll in which the improvements in- Specicatiion of Letters Patent. Application filed August as, 1911. serialNo. 645,499.

roll'is fed at a constantly diminishing ro.

tary speedso that itsweb may be fed at a uniform linearspeed.

Another object is to provide means'for introducing printed sheets cut and fed from a web, or sheets fed from' a source of cut sheet supply, into the offset weby winding A still'further object is to provide means for utilizing the'oilset web as a carrier' 'for feeding the sheets into the offset web winding roll.

A still further object is to provide meansfor manually controlling the operation of the driving mechanism for theolfset weby winding roll.

In the accompanying drawings,Figu.re 1

is a view in side elevation of so much of the sheet delivery mechanism of a printing` press as .will give a clear* understanding of my invention, Fig. 2 is a horizontal section -through the same taken-in the planes of the line A- A o-f. Fig. 1, and with the offset' web roll removed, Fig. 3 is 'a detailfront vview ofthe variable speed driving mechanism that shown in Figs. 1 and 2, Fig. ,4 is a detail side view of the same, Fig. v5: is a detail section showing more clearly the means for adjusting the throw of the crank on the driving shaft, and Fig. e is a detail side View '45 of the variable speed mechanismwithl the lparts in a-third position.

The oifsetweb is denoted by 1, its supply roll and shaft by 2 and 3; and its wind. roll and shaft by 4 and 5. The supply 3 is removably mounted in bearings 6 with the parts in a different position from` '40 Patented July 27, 1915.

and is providedwith a suitable friction brake mechanism-7 of, well known'or approved form for regulating the tension on the web -supply roll 2. The offset web 1 passes from the supply roll 2 first around a guide roll 8 and from thence over a guide roll 9. The printed sheets may be fed onto the web l from guides i0 in anysuitable A manner. l

I -will now proceed to describe the variable speed driving mechanism which is arranged to drive the offset web at a uniform .linear speed of travel, which mechanism vis so proy portioned that when on its highest speed it will drive the ,empty core on the winding shaft 5 fast enough to take care of the sheets from the press and will gradually diminish the rotary speed of. the winding roll shaft as the roll increases in size 'so as to keep the offset web traveling at a uniform linear speed. The'hrizontally arranged driving shaft 11 is mounted in suitablebearings 12,

13, which shaft isdriven from the press at chine.. This drive shaft 11 is provided with a pair of cone pulleys 23, 24, arranged to be moved toward and away from each other by suitable mechanism to be hereinafter described.

A horizontally arranged driven shaft 25 is mounted in suitable bearings 26, 27, which 'shaft isprovided with a pair of cone pulleys 28 29, arranged to be moved toward and away from each other in the opposite direction to the movement ofthe pulleys 23, 24, on the driving shaft 11. A belt 30 passes around these two' pairs of cone pulleys.

This shaft 25 .is provided with a pulley 31 and "the winding roll shaft 5 is provided '.with a. pulley 32 .around which a driving belt 33 passes. This driven shaft 25is further provided with a slotted crank disk 34.

An intermittentl rotatedishaft l35 is provided with a suitab e bearing 36, which shaft is provided with right and left hand'screw threaded portions 38, 39, engaging nuts 40, 41, at the corresponding ends of horizontally rocking levers 42, 43, pivoted at 44, 45, to brackets 46, 47. The rotation of this shaft 35 gradually moves one pair of cone pulleys toward each other andthe other pair of cone pulleys away from each other by providing the levers 42, 43, with yoke connections 48, 49, with the cone pulleys 23, 24, and with yoke connections 50, 51, with the`cone-pul leys 28, 29. The intermittent rotary movement of this shaft 35 for gradually decreasing the rotative speed of the shaft 25 and thereby the winding roll shaft 5, is accomplished by apawl and-ratchet connection between the shaft 35 and the crank 34 on the driven shaft 25 as follows :A ratchet wheel 52 is fixed to the shaft 35 and a friction device, such, for instance, as a spring 53, is interposed between the ratchet wheel and the bearing 36 for preventing a reverse movement of the ratchet wheel.

A pair of pawls 54, 55, are mounted lon a rocking arm 56 loosely mountedon the end of the shaft 35 and a pitman rod 57 connects this arm 56 with the crank 34.

Manually operated means are provided for adjusting the throw of the crank 34, and thereby the-rotative movement of the shaft 35, without stopping the operation of the parts, as follows The pitman rod 57 is connected to a nut 58 fitted to be moved radially in a groove 59 in the crank 34 by a screw 60. The head of this screw is provided with a plurality of arms61, and two manually operated levers 62, 63, are provided, the lever 62 being rocked intoposition to engage one of the arms 61 on the screw 60 when it is desired to turn the screw for lengthening the stroke .and thelever 63 is rocked in position to engage one of the arms 61 on the screw when it is desired to ratchet wheel 52 for rendering the pawls in turn the screw in a direction to shorten the stroke. In Fig. 6 the llever 62 is shown rocked into position to engage the screw for lengthening the stroke.

The drivin connection between the driven shaft 25 an the screw shaft 35 may be rendered inoperative at any time without stopping thev mechanism, as follows A segment 64 is carried by one arm 65 of a rock lever and the other arm 66 of 'which lever is connected to a hand lever 67 by a rod 68. This segment'64 projects over the ratchet wheel 52 and may be rocked into al position between the pawls 54, 55, and the operative whenever desired.

From the above description it will be seen that thespeed of rotation of the oset web winding roll shaft is completely under the control of the operator at all times withintacto out the necessity of stopping the driving v mechanism, thus permitting the operator to cause the offset web tobe moved at a predetermined linear speed or just fast enough printed product as it is Vmeans for moving the web at a predetermined linear speed by means of a variable speed driving'mechanism having manually operated devicesy for controlling the said variable speed driving mechanism.

1. An offset web' winding roll, its shaft, a variable speed driving mechanism for driving the winding roll shaft at a gradually diminishing rotative speed to cause the web totravel at a uniform linear speed and means for feeding printed sheets into the roll.

2. An offset web winding roll, its shaft, a variable speed driving mechanism for driving the winding roll shaft at a gradually diminishing rotative speed to cause the web to travel at a uniform linear speed, manually operated means acting on the variable speed driving mechanism for causing it to drive the winding roll shaft at an increased or decreased rotative speed when so desired, and means for feeding printed sheets into theroll.

3.- An oset web winding roll, its shaft, a variable speed driving mechanism for driving the winding roll shaft at a gradually diminishing rotative speed to cause the web to travel at a uniform linear speed, manually operated means acting on the variable speed driving mechanism for causing the winding roll shaft to be driven at a uniform rotative speed when so desired, and means for feeding printed sheets into the roll.

4. An offset web roll, means for the roll at a adually diminishing rotative speed, manua ly operated means for causing the roll to be driven at an increased, decreased or uniform rotative speed when so desired, and imeans for feeding .printed sheets into the roll. Y Y

5. An offset web supply roll, an o'set web .winding roll, its shaft, a variable speed printed sheets on to the offset web between the supply roll and winding roll.

.6. An offset web supply roll, an offset web winding roll, its shaft, intermediate guide rolls over .which the web passes from the supply roll to the winding roll, a variable speed driving mechanism for driving the as my invention, Ihave signed my name in winding roll shaft at a gradually dimlnishpresence of two witnesses, this twenty first ing rotative speed to cause the web to travel day of August A. D. 1911. at a uniform linear speed, and means. for t CHARLES P. COTTRELL. 5 feeding printed/ Ysheets on to the web be- Witnesses:

tween said guide'rolls. A. R. S'rmLMAN,

'In testimony, that I claim the foregoing 1 G. BURDIGK. 

